S-91286A612 5/16"-18 x 7/8" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws
High-Strength Grade 8 Steel Hex Head Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Exceptional load-bearing capacity with 150,000 psi tensile strength for demanding industrial applications
- Superior corrosion protection through zinc-flake coating, extending service life in harsh environments
- Reliable fastening performance with Grade 8 strength classification and Rockwell C33 hardness
- Optimized installation efficiency featuring external hex drive and coarse UNC threads for quick assembly
- Precise thread engagement with Class 2A fit ensuring consistent clamping force and vibration resistance
- Full thread coverage along the 7/8" length for maximum grip and load distribution
- Regulatory compliance assurance meeting ASME B18.2.1, SAE J429, RoHS 3, and REACH standards
Professional Applications & Engineering Value
Engineered for heavy-duty industrial applications, this Grade 8 hex head screw delivers exceptional performance in construction, machinery assembly, and structural frameworks. The zinc-flake coated steel construction provides superior corrosion resistance, addressing common failure points in outdoor or chemically aggressive environments. The 5/16"-18 UNC coarse thread design ensures rapid installation while maintaining secure fastening, particularly beneficial in high-vibration settings. With fully threaded configuration and external hex drive, this fastener offers maximum engagement and straightforward installation using standard tools, reducing assembly time and improving project efficiency across various industrial sectors.
Specification Summary & Compliance
This 5/16"-18 x 7/8" hex head screw features Class 2A thread fit per UNC standards, ensuring precise dimensional accuracy and reliable performance. Manufactured to meet ASME B18.2.1 and SAE J429 specifications for Grade 8 fasteners, it delivers consistent mechanical properties and dimensional conformity. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, guaranteeing environmental safety and regulatory adherence for global industrial applications.
